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Quasielastic light scattering, mutual diffusion and viscoelasticity of polymer solutions
Author(s) -
Wang C. H.,
And Z. Sun,
Zhang X. Q.
Publication year - 1994
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19940870117
Subject(s) - viscoelasticity , polystyrene , light scattering , relaxation (psychology) , diffusion , scattering , materials science , quasielastic scattering , polymer , thermodynamics , benzene , dynamic light scattering , polymer chemistry , physics , molecular physics , chemistry , nuclear magnetic resonance , optics , small angle neutron scattering , neutron scattering , organic chemistry , nanotechnology , psychology , social psychology , nanoparticle
Quasielastic light (QEL) scattering studies of semidilute solutions of polystyrene in benzene and benzene plus diethyl phthalate mixed solvents have been carried out. Comparisons are made between experiment and theoretical results. It is found that the relative amplitude of the viscoelastic modes depends on the coupling parameter β (defined in the text). For the solutions with β=0, no viscoelastic component is observed in the QEL scattering spectrum, consistent with the theoretical prediction. The amplitude and a relaxation time distribution of the viscoelastic component of the QEL scattering spectrum of PS in the mixed solvent are found to depend on time. Steady state values are obtained only after the solution is equilibrated for more than a month. Time evolution of the QEL spectrum has been investigated.